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8e605f14c5
Activating this hint using --sim-hints=no-nptl-pthread-stackcache means the glibc nptl stack cache will be disabled. Disabling this stack/tls cache avoids helgrind false positive race conditions errors when using __thread variables. Note: disabling the stack cache is done by a kludge, dependent on internal knowledge of glibc code, and using libpthread debug info. So, this kludge might be broken with newer glibc version. This has been tested on various platforms and various glibc versions 2.11, 2.16 and 2.18 To check if the disabling works, you can do: valgrind --tool=helgrind --sim-hints=no-nptl-pthread-stackcache -d -v ./helgrind/tests/tls_threads |& grep kludge If you see the below 2 lines, then hopefully the stack cache has been disabled. --12624-- deactivate nptl pthread stackcache via kludge: found symbol stack_cache_actsize at addr 0x3AF178 --12624:1:sched pthread stack cache size disabling done via kludge git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14313
119 lines
4.5 KiB
C
119 lines
4.5 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- A home for miscellaneous bits of information which pertain ---*/
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/*--- to the client's state. ---*/
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/*--- m_clientstate.c ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2013 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#include "pub_core_basics.h"
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#include "pub_core_vki.h"
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#include "pub_core_xarray.h"
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#include "pub_core_clientstate.h"
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/*-----------------------------------------------------------------*/
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/*--- ---*/
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/*--- Basic globals about the address space. ---*/
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/*--- ---*/
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/*-----------------------------------------------------------------*/
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/* Client address space, lowest to highest (see top of ume.c) */
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// TODO: get rid of as many of these as possible.
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/* ***Initial*** lowest address of the stack segment of the main thread.
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The main stack will grow if needed but VG_(clstk_base) will
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not be changed according to the growth. */
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Addr VG_(clstk_base) = 0;
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/* Initial highest address of the stack segment of the main thread. */
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Addr VG_(clstk_end) = 0;
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UWord VG_(clstk_id) = 0;
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/* linux only: where is the client auxv ? */
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/* This is set up as part of setup_client_stack in initimg-linux.c. */
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UWord* VG_(client_auxv) = NULL;
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Addr VG_(brk_base) = 0; /* start of brk */
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Addr VG_(brk_limit) = 0; /* current brk */
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/* A fd which refers to the client executable. */
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Int VG_(cl_exec_fd) = -1;
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/* A fd which refers to the fake /proc/<pid>/cmdline in /tmp. */
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Int VG_(cl_cmdline_fd) = -1;
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/* A fd which refers to the fake /proc/<pid>/auxv in /tmp. */
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Int VG_(cl_auxv_fd) = -1;
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// Command line pieces, after they have been extracted from argv in
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// m_main.main(). The payload vectors are allocated in VG_AR_CORE
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// (the default arena). They are never freed.
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/* Args for the client. */
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XArray* /* of HChar* */ VG_(args_for_client) = NULL;
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/* Args for V (augments, then those from the launcher). */
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XArray* /* of HChar* */ VG_(args_for_valgrind) = NULL;
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/* How many of the above not to pass on at execve time? */
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Int VG_(args_for_valgrind_noexecpass) = 0;
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/* The name of the client executable, as specified on the command
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line. */
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const HChar* VG_(args_the_exename) = NULL;
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// Client's original rlimit data and rlimit stack
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struct vki_rlimit VG_(client_rlimit_data);
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struct vki_rlimit VG_(client_rlimit_stack);
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// Name of the launcher, as extracted from VALGRIND_LAUNCHER at
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// startup.
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HChar* VG_(name_of_launcher) = NULL;
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/* Application-visible file descriptor limits */
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Int VG_(fd_soft_limit) = -1;
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Int VG_(fd_hard_limit) = -1;
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/* Useful addresses extracted from the client */
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/* Where is the __libc_freeres_wrapper routine we made? */
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Addr VG_(client___libc_freeres_wrapper) = 0;
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/* x86-linux only: where is glibc's _dl_sysinfo_int80 function?
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Finding it isn't essential, but knowing where it is does sometimes
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help produce better back traces. See big comment in
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VG_(get_StackTrace) in m_stacktrace.c for further info. */
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Addr VG_(client__dl_sysinfo_int80) = 0;
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/* Address of the (internal) glibc nptl pthread stack cache size,
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declared as:
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static size_t stack_cache_actsize;
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in nptl/allocatestack.c */
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SizeT* VG_(client__stack_cache_actsize__addr) = 0;
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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